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A-level Biology · AQA 7402

3.1 Biological molecules: AQA A-level Biology video lessons

Monomers and polymers, carbohydrates, lipids, proteins and enzymes, nucleic acids, ATP, water and inorganic ions, with the exam questions that test them.

3.1.1 Monomers and polymers

  1. Condensation and Hydrolysis Reactions

    AQA 7402 · 3.1.13:103 marks

3.1.2 Carbohydrates

  1. Maltose, Sucrose, Lactose: Glycosidic Bonds

    AQA 7402 · 3.1.23:414 marks

  2. Alpha vs Beta Glucose: Starch vs Cellulose

    AQA 7402 · 3.1.24:554 marks

  3. Benedict's and Iodine Tests Explained

    AQA 7402 · 3.1.23:554 marks

3.1.3 Lipids

  1. Triglycerides: Saturated vs Unsaturated Fats

    AQA 7402 · 3.1.34:034 marks

  2. Phospholipids vs Triglycerides: Emulsion Test

    AQA 7402 · 3.1.34:145 marks

3.1.4 Proteins

  1. Amino Acids and Peptide Bonds Explained

    AQA 7402 · 3.1.4.13:314 marks

  2. Protein Structure: Primary to Quaternary

    AQA 7402 · 3.1.4.14:535 marks

  3. Globular vs Fibrous Proteins and Biuret Test

    AQA 7402 · 3.1.4.13:454 marks

  4. How Enzymes Work: Active Site and Induced Fit

    AQA 7402 · 3.1.4.24:354 marks

  5. Enzymes: Temperature and pH Effects

    AQA 7402 · 3.1.4.24:36Maths skill4 marks

  6. Enzyme Rate Graphs: Why the Plateau

    AQA 7402 · 3.1.4.23:494 marks

  7. Competitive vs Non-Competitive Inhibitors

    AQA 7402 · 3.1.4.24:254 marks

  8. Required Practical 1: Enzyme Rates

    AQA 7402 · 3.1.4.24:18Required practical 1Maths skill5 marks

3.1.5 Nucleic acids

  1. DNA and RNA Nucleotides: Structure Compared

    AQA 7402 · 3.1.5.14:374 marks

  2. DNA Double Helix and Phosphodiester Bonds

    AQA 7402 · 3.1.5.14:15Maths skill4 marks

  3. DNA Replication: Helicase and Polymerase

    AQA 7402 · 3.1.5.25:065 marks

  4. Meselson and Stahl Experiment Explained

    AQA 7402 · 3.1.5.24:274 marks

3.1.6 ATP

  1. ATP: Structure, Hydrolysis and Resynthesis

    AQA 7402 · 3.1.64:065 marks

3.1.7 Water

  1. Water: Five Properties Linked to Function

    AQA 7402 · 3.1.73:314 marks

3.1.8 Inorganic ions

  1. Inorganic Ions and Their Roles

    AQA 7402 · 3.1.83:124 marks